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Chapter 11 Advanced Batch Files

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Chapter 11 Advanced Batch Files Instructor’s Manual Chapter 11 Lecture Notes Advanced Batch Files Chapter 11 Advanced Batch Files LEARNING OBJECTIVES 1. List the commands used in batch files. 2. List and explain batch file rules. 3. Explore the function of the REM, PAUSE, and ECHO commands. 4. Explain the use of batch files with short cuts. 5. Explain the purpose and function of the GOTO command. 6. Explain the purpose and function of the SHIFT command. 7. Explain the purpose and function of the IF command. 8. Explain the purpose and function of the IF EXIST/IF NOT EXIST command. 9. Explain the purpose and function of the IF ERRORLEVEL command. 10. Explain the purpose and function of writing programs. 11. Explain the purpose and function of the environment and environmental variables. 12. Explain the use of the SET command. 13. Explain the purpose and function of the FOR…IN…DO command. 14. Explain the purpose and function of the CALL command. STUDENT OUTCOMES 1. Use the ECHO command to place a blank line in a batch file. 2. Use the GOTO command in conjunction with a label to create a loop. 3. Use a batch file with a shortcut. 4. Use the SHIFT command to move parameters. 5. Use the IF command with strings for conditional processing. 6. Test for null values in a batch file. 7. Use the IF EXIST/IF NOT EXIST command to test for the existence of a file or a subdirectory. 8. Use the SET command. 9. Use the environment and environmental variables in batch files. 10. Use the IF ERRORLEVEL command with XCOPY to write a batch file for testing exit codes. 11. Use the FOR…IN…DO command for repetitive processing. 12. Use the CALL command in a batch file. CHAPTER SUMMARY 1. You may substitute a double colon (::) for the REM statement. 2. To place a blank line in a batch file, use the ECHO command followed immediately by a period (ECHO.). Carolyn Z. Gillay, Bette A. Peat, Windows XP Command Line, Instructor’s Manual Franklin, Beedle & Associates ©2003 Page 1 Instructor’s Manual Chapter 11 Lecture Notes Advanced Batch Files 3. The GOTO command used in conjunction with a label creates a loop. The GOTO will process the command following the label. 4. The label in a batch file is not a command, but identifies a location in the batch file. 5. The SHIFT command shifts over command line parameters to the left one position at a time. 6. The SHIFT command is typically used in conjunction with GOTO and a label. 7. The IF command will test for some logical condition. If the condition is true, the command will be processed. If the condition is false, the batch file will fall through to the next line of the batch file. 8. The IF command can test whether or not two character strings are identical. 9. The IF command can test whether or not a file exists. 10. The IF command checks ERRORLEVEL. 11. You may also use IF with NOT. The IF NOT command will test for a NOT condition. If a condition is not true, then the command will process. If the command is true, then the batch file will fall through to the next line in the batch file. 12. You can test for a null value by using quotation marks, a word, or backslashes. 13. To use IF EXIST and to test for the existence of a subdirectory, you may use IF %1\NUL. 14. Many programs set an exit code when finished executing. The IF ERRORLEVEL in a batch file will test if an exit code is equal to or greater than the one in the test. 15. When you use IF ERRORLEVEL in a batch file, the codes must be listed in descending order. 16. When you use IF NOT ERRORLEVEL in a batch file, the codes must be listed in ascending order. 17. You may write programs with DEBUG to set exit codes. 18. You can write programs directly in DEBUG, or you may write a script file that supplies input for DEBUG to create a program. 19. The environment is an area in memory where the operating system leaves messages to itself, including the path and the prompt values. 20. You can create environmental variables that can be used in batch files. When using the variable in a batch file, the syntax is %variable%. 21. The SET command lets you view what is currently in the environment. 22. Environmental variables set in other batch files or at the command line remain in effect only during the current Command Prompt session. When the Command Prompt window is closed, the variable disappears. 23. The DIRCMD command can be used to preset the DIR command parameters and switches. 24. The FOR…IN…DO command allows repetitive processing. The command will execute some command for every value in a specified set. 25. When you use FOR…IN…DO at the command line, the syntax is FOR %variable IN (set) DO command [command-parameter]. 26. The /R when used with FOR…IN…DO allows recursive processing. Recursive means that the command will search all the directories. 27. Using the /F parameter allows you to select specified text using delimiters that you can set. 28. The CALL command allows you to call one batch file from another. When the second batch file is finished executing, it returns control to the first batch file. KEY TERMS Carolyn Z. Gillay, Bette A. Peat, Windows XP Command Line, Instructor’s Manual Franklin, Beedle & Associates ©2003 Page 2 Instructor’s Manual Chapter 11 Lecture Notes Advanced Batch Files debug environmental variable recursive EOF (end-of-file) mark expression scan code exit code loop script file conditional processing null value variable environment LECTURE NOTES CHAPTER OUTLINE Chapter Overview Quick review of batch file commands learned in earlier chapters. Advanced features of these commands will be explained and used. Will explain the purpose and function of remaining batch file commands and then will use these commands to write sophisticated batch files. Will refine techniques in working with environment. BATCH FILE COMMANDS Batch File Commands Batch file rules. Has .BAT or .CMD as file extension. Must be ASCII file. Must include legitimate commands. Create generic batch files using replaceable parameters. Are not case-sensitive. Can use any command in batch file that can be used on the command line. Many special batch file commands. See PowerPoint slides # for list of commands and their purposes. Batch files have a limited vocabulary, syntax, and programming logic. Limited in kind of programming they can do. Not as versatile as "real" programming languages. A REVIEW OF THE REM, PAUSE, AND ECHO COMMANDS A Review of the REM, PAUSE, and ECHO Commands REM. Used to document batch files. Up to string of 123 characters. ECHO on - displays but does not execute what follows REM. Won't display if ECHO is off. Placing REM in front of a command will disable but not delete that specific line. Batch file or CONFIG.SYS file will continue to execute. Disables line without deleting it. PAUSE. Carolyn Z. Gillay, Bette A. Peat, Windows XP Command Line, Instructor’s Manual Franklin, Beedle & Associates ©2003 Page 3 Instructor’s Manual Chapter 11 Lecture Notes Advanced Batch Files <Ctrl> + C or <Ctrl> + <Break> interrupts program. Temporarily stops executing batch file. Will not continue until user presses a key. Will not do any conditional processing. ECHO. Used on command line or in batch file. Controls printing of messages on screen when batch file is run. ECHO ON (Default) displays all commands to screen along with output. Useful when tracking operation of a batch file Clutters screen when batch file runs successfully ECHO OFF Displays only output of commands to screen. ECHO <text string> displays text string to screen. Precede ECHO OFF with @ and “ECHO OFF” will not appear on screen. ADVANCED FEATURES OF ECHO AND REM Advanced Features of ECHO and REM REM slows processing of a batch file. Recognized by OS as command and must be processed. Replace REM with double colon (::) for faster processing. Label - single colon followed by anything. Using double colon (::) because labels skipped by OS. With ECHO OFF, messages still come on screen. Redirecting output to NUL device eliminates standard output messages. Will not suppress messages like “File not found”. To generate blank line on screen: Use ECHO followed by a period (ECHO.). No space between ECHO and period. Using <Enter> will not work in batch files. ACTIVITY—USING ECHO AND NUL Using ECHO and NUL DATA disk in Drive A, A:\> displayed. Activity steps. Use editor to create/save batch file called ONE.BAT press enter only where indicated :: This is a test of a batch file using <Enter> :: different features. <Enter> COPY CAROLYN.FIL BOOK.FIL <Enter> <Enter> TYPE BOOK.FIL <Enter> ECHO <Enter> DEL BOOK.FIL <Enter> COPY NO.FIL BOOK.FIL <Enter> Close Editor and key in TYPE ONE.BAT Key in: ONE Edit/save ONE.BAT so it looks as follows: Carolyn Z. Gillay, Bette A. Peat, Windows XP Command Line, Instructor’s Manual Franklin, Beedle & Associates ©2003 Page 4 Instructor’s Manual Chapter 11 Lecture Notes Advanced Batch Files @ECHO OFF :: This is a test of a batch file using :: different features COPY CAROLYN.FIL BOOK.FIL > NUL ECHO. TYPE BOOK.FIL ECHO. DEL BOOK.FIL COPY NO.FIL BOOK.FIL > NUL Key in: ONE Activity completed. THE GOTO COMMAND The GOTO Command Use GOTO command to have batch file constructed to behave like a program. Allows looping & branching within batch files.
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